For #1638, #307, remove unused bash variable.

Author: winlinvip

trunk/configure

@@ -150,7 +150,6 @@ LibSTRoot="${SRS_OBJS_DIR}/st"; LibSTfile="${LibSTRoot}/libst.a"
 if [[ $SRS_SHARED_ST == YES ]]; then LibSTfile="-lst"; fi
 # srtp
 LibSrtpRoot="${SRS_OBJS_DIR}/srtp2/include"; LibSrtpFile="${SRS_OBJS_DIR}/srtp2/lib/libsrtp2.a"
-if [[ $SRS_SHARED_SRTP == YES ]]; then LibSrtpFile="-lsrtp2"; fi
 # openssl-1.1.0e, for the RTMP complex handshake.
 LibSSLRoot="";LibSSLfile=""
 if [[ $SRS_SSL == YES && $SRS_USE_SYS_SSL == NO ]]; then